Support PB_CLIENT_TYPE environment var to configure connector type
Support PB_CLIENT_TYPE environment var to configure connector type

Provided values can be socket, zmq, or evented.
Values are case-insensitive. If a value is provided
outside of this range the default type will be
loaded instead (socket) while printing a warning.
ruby-protobuf/protobuf,ruby-protobuf/protobuf,film42/protobuf,brianstien/protobuf,quixoten/protobuf,brianstien/protobuf,lookout/protobuffy,zanker/protobuf,film42/protobuf,localshred/protobuf,localshred/protobuf,lookout/protobuffy,quixoten/protobuf,zanker/protobuf